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Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
May 31, 2012 | May 31, 2011 | May 31, 2010
Operating activities |  |  |
Net income | $ 548.0 | $ 515.3 | $ 477.0
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization on property and equipment and intangible assets | 97.8 | 88.7 | 86.5
Amortization of premiums and discounts on available-for-sale securities | 42.5 | 38.9 | 35.0
Stock-based compensation costs | 22.9 | 24.8 | 25.6
Provision for/(benefit from) deferred income taxes | 11.7 | 13.6 | (3.9)
Provision for allowance for doubtful accounts | 1.2 | 1.8 | 2.6
Provision for litigation reserve |  |  | 18.7
Net realized gains on sales of available-for-sale securities | (1.0) | (1.3) | (3.2)
Changes in operating assets and liabilities: |  |  |
Interest receivable | (1.2) | (0.7) | (1.0)
Accounts receivable | 17.6 | 23.7 | (10.2)
Prepaid expenses and other current assets | (9.4) | 1.8 | (2.5)
Accounts payable and other current liabilities | (26.9) | 2.2 | (15.0)
Net change in other assets and liabilities | 3.4 | 6.5 | 1.3
Net cash provided by operating activities | 706.6 | 715.3 | 610.9
Investing activities |  |  |
Purchases of available-for-sale securities | (10,180.5) | (6,229.1) | (1,554.9)
Proceeds from sales and maturities of available-for-sale securities | 9,817.4 | 5,598.9 | 1,152.0
Net change in funds held for clients' money market securities and other cash equivalents | (784.3) | 450.4 | 61.7
Purchases of property and equipment | (89.6) | (100.5) | (61.3)
Acquisition of businesses, net of cash acquired | (6.0) | (126.4) |
Proceeds from sale of business |  |  | 13.1
Purchases of other assets | (1.3) | (2.8) | (11.9)
Net cash used in investing activities | (1,244.3) | (409.5) | (401.3)
Financing activities |  |  |
Net change in client fund obligations | 980.5 | (34.9) | 42.3
Dividends paid | (460.5) | (448.8) | (448.6)
Proceeds from exercise and excess tax benefit related to stock-based awards | 7.5 | 12.6 | 8.2
Net cash provided by/(used in) financing activities | 527.5 | (471.1) | (398.1)
Decrease in cash and cash equivalents | (10.2) | (165.3) | (188.5)
Cash and cash equivalents, beginning of fiscal year | 119.0 | 284.3 | 472.8
Cash and cash equivalents, end of fiscal year | $ 108.8 | $ 119.0 | $ 284.3

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